Brake shoe



Sept. 25, 1951 SUPER 2,568,777

BRAKE SHOE Filed Oct. 13, 1947 INVENTOR. Ralph K. Sqper A fforneys Patented Sept. 25, 1 951 Z MTE STA BRAKE SHOE RaIph K. Super, Detroit, Mich; assignor to The Timken-Detroit Axle Company, Detroit, Mich.,

.a. corporation of Ohio Application October 13.1947, Serial No. 779,547

.3Claims'. (01. 188250) This invention relates generally to internally expanding brakes and more specifically to improved fabricated brake shoes for heavy duty brakes of this type. The invention comprises a brake shoe provided with an arcuate platform on which the lining material is mounted and a channel shaped reenforcing member secured along the inner periphery of the platform.

It is therefore the major object ofthis invention to provide a fabricated brake shoe having an arcuate platform adapted to carry a friction lining member on its outer periphery and having a reenforcing member of channel shaped transverse cross-section secured along its inner periphery. I I I It is a further object of this invention to provide a brake shoe having an arcuate platform with a reenforcing member secured along its inner periphery, the reenforcing member comprising a pair of laterally spaced radially extending side walls .connected together at one oftheir peripheries.

It is a still further object of this invention to provide a novel brake shoe having an arcuate liningmounting platform and a reenforc- 2 vide a novel brake shoe construction embodying an arcuate lining platform reenforced by a channel extending along its inner periphery and having brake shoe pivot and cam follower sup-- port members secured across and closing opposite ends of the channel.

These and other objects will become apparent as the specification proceeds in connection with the annexed drawings wherein:

ing member secured along the inner periphery" of the platform, the reenforcing member having;

a pair of spaced side walls projecting inwardly from the platform, a lateral flange on the outer periphery of each side wall for securing the walls to the platform and an arcuate web connecting the inner peripheries of said side walls.

Another object of this invention is to provide a brake shoe having an arcuate platform-and a channel shaped reenforcing member secured along the inner periphery of the platform, the

channel of the reenforcing member being of agreater depth intermediate the ends of the member.

A still further object of this invention is to provide a brake shoe having an arcuate -p1at-' form and a channel shaped reenforcing member with spaced side walls secured along the inner periphery of the platform and reenforcing closures at each end.

A still further object of this invention is to provide a brake shoe having an arcuate plat- H form and a channel shaped reenforcing'memher with spaced side walls secured along the inner periphery of the platform and a yoke secured to each extremity of the reenforcing member to close and strengthen the channel formed between the spaced side walls and provide a pair of spaced legs on opposite ends of the shoe.

A further object of the invention is to pro- Figure l is a side elevation illustrating a brake shoe according to a preferred embodiment of this invention, the axle flange on which the brake shoe is pivoted and the actuating cam being illustrated in phantom lines;

Figure 2 is an inner end view of the brake shoe looking substantially along line 22 of Figure 1 and illustrating the manner in which the reenforcing member is secured to the shoe platform; e

Figure 3 is a section on line 3+3 of Figure 1' illustrating intermediate structure of the brake shoe;

Figure 4 is a section on line 44 of Figure 1 illustrating the yoke for mounting a cam following roller; and

Figure 5 is a section on line 5-5 of Figure 1 illustrating the yoke for pivotally mounting the brake shoe.

The specification continues with reference to the drawings wherein like numerals designate like parts throughout the several figures.

Figure 1 illustrates the invention as mounted for operation in'an axle assembly. A brake shoe generally indicated at II is pivotally mounted at one end at l2 on an axle mounted flange l3. At the opposite end of the shoe, flange l3 carries a rotatable cam M which acts with a cam fol-- lower roller'lli for actuating the shoe. A tension spring [6 resiliently holds the cam follower and cam in contact.

The brake shoe comprises an arcuate metal band I! servingas a platform for mounting one or more friction lining elements 18 with a reenforcing 'member l9 welded or otherwise per-' -manently secured along the inner periphery of form and thus strengthen side walls 2| laterally and also reenforce the platform against deflection. An arcuate web 23, which in Figure 3 is the bottom wall of the channel, integrally connects the inner peripheries of side walls 2i for adding resistance to transverse deflection. Preferably the inner radius of curvature of web 23 is eccentrierto theiradius of curvature of platform I! to.,make the reenforcingchannel deeper intermediate the ends of the shoe so that the shoe has maximum resistance where bending greatest.

end ofssaid shoe comprising a yoke of metal of One end of the brake shoe is provided with a pivot mounting which also furtherstrengthen's the shoe. Preferably this mountingx comprises a yoke 25 which is secured to the shoe atone open end of channel [9. Yoke 25 comprises.arplateifi a which extends across and substantially closes the open end of the channel and is weldedgtor-sidee.

walls 2| and web 23 of the reenforcing member and 'gh-asa p airof spaced legs 27 extending from the end ofvthe shoe. Legs-21;embrace.ahboss 28 on; lange. 3 anda suitable pin 29 1s provided to;

pivot thebrake shoe on tthe'fianger Anlopening Wise-{formed in'plate. 26 for cleaning out and draining the channel.

Theeother endof the: brake shoe-is provided withn a; 'ca-mfollower mounting which also strengthens the shoe; Preferably-this mounting is a yoke 33which-is secured to the'shoe at the other end of the channel. Yoke 33. comprises a plates-(which extends across-and substantially;- closes thaopen end or the channel and'is welded to both side walls 21 and weblZS of =thereenforcing;;member and ha-S- a pairof-spaced legs v35 ex! tending to'wardthelend of the shoe. Legs are aperturedat 36 to mounta shaft al for journal,

ling cam:followenroller i5 between them. An

opening 39 is provided in plate 34 for cleaning out and dra-ining the channel.

I have thus provided: a fabricated brake shoe;

which utilizes a minimum amount of metal with.

considerablestructural rigidity- The shoe is preterably;v made up .of four. elements, the: plat:

form, reenforcing channel and the tWO- BIIQYQKBS which are-all Welded- .togetherand; supply mutual strength-fin the assembly. The channelaffords;

extremely good resistance to longitudinal. bend.- ing;;of thelining-platform, and itsmanner of at:

tachmentto the platform effectively thickens'theplatform andincreases its resistancetordeforma-;

tion even at the high temperatures encountered in,-,heavy; duty; braking. Theyokes, besidespro viding -the pivot and cam follower attachments,.. bridgethe channel ends and: thereby increase. the:

rigidityof. the. channel and, the overall, resistance of the shoe to distortion.

Aoseries of apertures 7 are provided; platf to. receive fastening? elements-such as rivets-i9 1";

securing the friction lining elements tothe shoe, and these apertures also: pass through v the. lateral flanges of: the 'reenforcing' channel, whereby the; rivets help ;to strengthen the connection; between-- therplatfor-m; and the reenforcingmember.-

The. invention .may be: embodied in other specific; forms,wit hout departing from the spirit or! essential;. characteristics. thereof.

embodiments. are thereforeto be considered in all respectsas illustrativeandnot restrictive, the.

scopeof the invention being indicated by the apipended clainis ratherthan by the foregoingdescriptijon andg alljchanges which come within the} efore intended egnivalency of the. claims are ther to b e'em brace'd therein.

The present 7 Number Name. Date 3 413. 1 Gh 6.- -.---.-?-..--.-.e-.- e 19 11 much-heavier gauge than said channel member .brideedacross; esadi open end o said channel memberzandi welded thereto and having spaced. zaperture'd -pivot legs projecting from the en of..the. shoe. and a cam follower roller mount secured permanently to the other end of said shoe Zoom-prising: a yoke of metal of much heavier gauge than said channel member bridged across fiiiadlhc n gopenoend. of said channel member and el'ded; there o ldhaving spaced apertured, rollcr;,piyot.-. legs pro 3' ecting from said other; end. of1.;th eshoe said: legs all being substantially par;- filvto eaohyother and the side wallsor said Chg -me er-i 2;; A-.- fabricated.brake shoe. structure. consist-1 ing-otx-ar-i: ,arcuate metal, platform of substantial} strength having :an outer surface. serving as the ,underlying support-for a friction lining a simi-Q larly arguatemetal channel-having its open end weldedalonggtheinner surface; of said platformi outpt contact with said lining asubstantially .U-

shapedanchgrspingpivot, mount member of much heavier gauge metal than said channel haying.its, closed endbridged aeross'oneend of said channel and welded to the platform-and the channel side 5 walls, latter'arerigidly spaced thereby, andl a substantially ueshaped cam follower roller sup sof much heavier gauge metal than having its; closedend bridged across portmemb s id cha n the other end of said channel and welded to the;

andthe channel: side walls, which latter spaced thereby, said assembly comprising permanentunitary welded construction:

Ofihigh strengtlr and resistance to deformation eration; of the-brake, and all of the armsdu-rln V ofss dv shaped members extending from the ends :of .said channel par he-. haene sidea .3 offour m talnelements permanently secured toether into aunitary v structure wherein they mutually reinf orce each other comprising a longitudinally;arcuate channel member, a friction lining platform secured along and across the open, side of-.saidchannel member, andreinforcing yokes of much heavier gauge than said channelmember Welded across the open opposite ends-of said channel-member, eachv yokehaving spaced s rprojecting from the end rnsaid brakelshoel h other andto the. chemgenerallymarallel toeac elisi e w ll -q. r v

- VRALPHIK. SUPER.

REFERENCES. CITED The following references are of;record. inzthe files ft i spatent 'UNITED iSTA-TES "PATENTS 1.951 35? Evans M y 8 1934;.

allel toeach. otherand \fabricated brake .shoe structure consisting 

